UIWebView获得内容的高 高度自适应 宽度自适应

UIWebView获得内容的高-作出自适应高的UIWebView
- (void)webViewDidFinishLoad:(UIWebView *)webView { NSString *height_str= [webView stringByEvaluatingJavaScriptFromString: @"document.body.offsetHeight"]; int height = [height_str intValue]; webView.frame = CGRectMake(0,0,320,height); NSLog(@"height: %@", [webView stringByEvaluatingJavaScriptFromString: @"document.body.offsetHeight"]); }
IOS UIWebView截获html并修改便签内容,宽度自适应
iosuiwebview宽度自适应 
需求:混合应用UIWebView打开html后,UIWebView有左右滚动条,要去掉左右滚动效果; 
方法:通过js截获UIWebView中的html,然后修改html标签内容; 
实例代码: 
服务器端html
Java代码  收藏代码
<html><head>  
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">  
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">   
<title>网曝四川省一考场时钟慢半小时 老师称这就是命</title></head<body>网曝四川省一考场时钟慢半小时 老师称这就是命</body></html>  

这样显示的结果网页的最小宽度会是device-width;但有时候不需要这个宽度,就需要修改width=device-width为width=myWidth; 
客户端代码
Java代码  收藏代码
- (void)webViewDidFinishLoad:(UIWebView *)webView  
{     
    //修改服务器页面的meta的值  
    NSString *meta = [NSString stringWithFormat:@"document.getElementsByName(\"viewport\")[0].content = \"width=%f, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no\"", webView.frame.size.width];  
    [webView stringByEvaluatingJavaScriptFromString:meta];  
}  

这样问题就可以解决了 

新增代码: 

Java代码  收藏代码
//给网页增加utf-8编码  
 [webView stringByEvaluatingJavaScriptFromString:  
 @"var tagHead =document.documentElement.firstChild;"  
  "var tagMeta = document.createElement(\"meta\");"   
  "tagMeta.setAttribute(\"http-equiv\", \"Content-Type\");"   
  "tagMeta.setAttribute(\"content\", \"text/html; charset=utf-8\");"   
  "var tagHeadAdd = tagHead.appendChild(tagMeta);"];  
 
Java代码  收藏代码
//给网页增加css样式  
    [webView stringByEvaluatingJavaScriptFromString:  
     @"var tagHead =document.documentElement.firstChild;"  
     "var tagStyle = document.createElement(\"style\");"   
     "tagStyle.setAttribute(\"type\", \"text/css\");"   
     "tagStyle.appendChild(document.createTextNode(\"BODY{padding: 20pt 15pt}\"));"  
     "var tagHeadAdd = tagHead.appendChild(tagStyle);"];  


Java代码  收藏代码
//拦截网页图片  并修改图片大小        
[webView stringByEvaluatingJavaScriptFromString:  
 @"var script = document.createElement('script');"   
 "script.type = 'text/javascript';"   
 "script.text = \"function ResizeImages() { "   
     "var myimg,oldwidth;"  
     "var maxwidth=380;" //缩放系数   
     "for(i=0;i <document.images.length;i++){"   
         "myimg = document.images[i];"  
         "if(myimg.width > maxwidth){"   
             "oldwidth = myimg.width;"   
             "myimg.width = maxwidth;"   
             "myimg.height = myimg.height * (maxwidth/oldwidth);"   
         "}"   
     "}"   
 "}\";"   
 "document.getElementsByTagName('head')[0].appendChild(script);"];   
  
[webView stringByEvaluatingJavaScriptFromString:@"ResizeImages();"];  

转载于:https://www.cnblogs.com/someonelikeyou/p/3578500.html

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转载自blog.csdn.net/weixin_33755847/article/details/94538772